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Design News note on excessive voltage

 
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nuckolls.bob(at)aeroelect
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PostPosted: Wed Sep 26, 2012 5:46 am    Post subject: Design News note on excessive voltage Reply with quote

At 08:21 AM 9/26/2012, you wrote:


do not archive

There is a note in Design News on how an aircraft electrical system
developed very high voltage: Probably rare but worth knowing. I
personally doubt the veracity of it.

Agreed. The energy required to char stuff is significant.
Far greater than the transient energies contained in the
spectrum of relay chatter products. His anecdotal inclusion
of the missing ground on a 3-phase delta was not germane
to the core assertion, nor was the introductory anecdote
about 400Hz 3-phase power.

It would be interesting to see detailed circuitry and
study his FMEA that supports the 'feedback path' to
a 'main power relay'. I know there is a growing notion
that computers, particularly big and hairy byte thrashers
can and should be tasked with controlling everything.
Such thoughts gave rise to DO-178 level A software
certs that give harsh meaning to the "blue screen
of death".

The first time I enjoyed any inside info about the
Eclipse 500, I was told that a systems management
computer was going to 'do everything' . . . even
manage circuit breakers off of the bus. One could
open breakers by means of touch-screen icons.

Which begs the question. If I have flow nearly
1000 hours and never had the slightest inclination
to fiddle with breakers (See chapter 17) then
why on earth would one put a computer in charge
of such decisions and make it 'easier' for me
to do it too? I see CA is now figuring out how
to license driverless cars, yet one more step
toward reducing the human operator to status
of mere passenger in the vehicle of life.

I would rather it not so but the author of that
little tid-bit in Design News sounds like a
'passenger' to me.
Bob . . .


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